diff --git a/core/base/ActionTween.h b/core/base/ActionTween.h
index 6f710c02..a7074fe0 100644
--- a/core/base/ActionTween.h
+++ b/core/base/ActionTween.h
@@ -26,7 +26,7 @@
 namespace easy2d
 {
 	// 缓动函数枚举
-	// More infomation about ease functions, see https://easings.net
+	// See https://easings.net for more information
 	enum class EaseFunc
 	{
 		Linear,			// 线性
diff --git a/core/base/Frames.h b/core/base/Frames.h
index 9108e824..d82059bc 100644
--- a/core/base/Frames.h
+++ b/core/base/Frames.h
@@ -34,28 +34,28 @@ namespace easy2d
 		Frames();
 
 		explicit Frames(
-			Images const& frames			/* 关键帧数组 */
+			Images const& frames		/* 关键帧数组 */
 		);
 
 		explicit Frames(
-			Duration const& interval	/* 帧间隔（秒） */
+			Duration const& interval	/* 帧间隔 */
 		);
 
 		explicit Frames(
-			Duration const& interval,	/* 帧间隔（秒） */
-			Images const& frames			/* 关键帧数组 */
+			Duration const& interval,	/* 帧间隔 */
+			Images const& frames		/* 关键帧数组 */
 		);
 
 		virtual ~Frames();
 
 		// 添加关键帧
 		void Add(
-			SpImage const& frame		/* 关键帧 */
+			SpImage const& frame
 		);
 
 		// 添加多个关键帧
 		void Add(
-			Images const& frames			/* 关键帧数组 */
+			Images const& frames
 		);
 
 		// 获取帧间隔
@@ -66,7 +66,7 @@ namespace easy2d
 
 		// 设置每一帧的时间间隔
 		void SetInterval(
-			Duration const& interval	/* 帧间隔（秒） */
+			Duration const& interval
 		);
 
 		// 获取帧动画的拷贝对象
diff --git a/core/base/time.cpp b/core/base/time.cpp
index 95460250..7babbe36 100644
--- a/core/base/time.cpp
+++ b/core/base/time.cpp
@@ -74,7 +74,7 @@ namespace easy2d
 
 		const Duration TimePoint::operator-(const TimePoint & other) const
 		{
-			return Duration{ dur - other.dur };
+			return Duration(dur - other.dur);
 		}
 
 		TimePoint& TimePoint::operator=(const TimePoint & other) E2D_NOEXCEPT
@@ -250,11 +250,6 @@ namespace easy2d
 			return Duration(milliseconds_ * val);
 		}
 
-		const Duration Duration::operator/(int val) const
-		{
-			return Duration(milliseconds_ / val);
-		}
-
 		const Duration easy2d::time::Duration::operator*(unsigned long long val) const
 		{
 			return Duration(static_cast<long>(milliseconds_ * val));
@@ -265,11 +260,6 @@ namespace easy2d
 			return Duration(static_cast<long>(milliseconds_ * val));
 		}
 
-		const Duration Duration::operator/(float val) const
-		{
-			return Duration(static_cast<long>(milliseconds_ / val));
-		}
-
 		const Duration Duration::operator*(double val) const
 		{
 			return Duration(static_cast<long>(milliseconds_ * val));
@@ -280,6 +270,16 @@ namespace easy2d
 			return Duration(static_cast<long>(milliseconds_ * val));
 		}
 
+		const Duration Duration::operator/(int val) const
+		{
+			return Duration(milliseconds_ / val);
+		}
+
+		const Duration Duration::operator/(float val) const
+		{
+			return Duration(static_cast<long>(milliseconds_ / val));
+		}
+
 		const Duration Duration::operator/(double val) const
 		{
 			return Duration(static_cast<long>(milliseconds_ / val));
diff --git a/core/base/time.h b/core/base/time.h
index 15dab658..2375340d 100644
--- a/core/base/time.h
+++ b/core/base/time.h
@@ -43,7 +43,7 @@ namespace easy2d
 		public:
 			Duration();
 
-			explicit Duration(
+			Duration(
 				long milliseconds
 			);
 
@@ -110,6 +110,7 @@ namespace easy2d
 			long milliseconds_;
 		};
 
+		/* 预定义的时间段 */
 		extern const Duration Millisecond;	// 毫秒
 		extern const Duration Second;		// 秒
 		extern const Duration Minute;		// 分钟
@@ -136,7 +137,7 @@ namespace easy2d
 		public:
 			TimePoint();
 
-			explicit TimePoint(
+			TimePoint(
 				long
 			);